package com.kit.app;

import android.annotation.SuppressLint;
import android.content.Context;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;
import android.os.Build;
import android.os.Environment;
import android.os.Looper;
import android.widget.Toast;

import com.kit.config.AppConfig;
import com.kit.utils.AppUtils;
import com.kit.utils.ZogUtils;
import com.kit.utils.StringUtils;

import java.io.File;
import java.io.FileOutputStream;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.io.Writer;
import java.lang.Thread.UncaughtExceptionHandler;
import java.lang.reflect.Field;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;

/**
 * UncaughtException处理类,当程序发生Uncaught异常的时候,有该类来接管程序,并记录发送错误报告.
 *
 * @author user
 */
@SuppressLint("SdCardPath")
public class CrashHandler implements UncaughtExceptionHandler {

    // public static final String TAG = "CrashHandler";

    // 系统默认的UncaughtException处理类
    private Thread.UncaughtExceptionHandler mDefaultHandler;
    // CrashHandler实例
    private static CrashHandler INSTANCE = new CrashHandler();
    // 程序的Context对象
    private Context mContext;
    // 用来存储设备信息和异常信息
    private Map<String, String> infos = new HashMap<String, String>();

    private String appName = "";
    // 用于格式化日期,作为日志文件名的一部分
    @SuppressLint("SimpleDateFormat")
    private DateFormat formatter = new SimpleDateFormat("yyyy-MM-dd-HH-mm-ss");

    // private IDoSomethingWhenCrash doSomethingWhenCrash;

    /**
     * 保证只有一个CrashHandler实例
     */
    public CrashHandler() {
    }

    /**
     * 获取CrashHandler实例 ,单例模式
     */
    public static CrashHandler getInstance() {
        return INSTANCE;
    }

    /**
     * 初始化
     *
     * @param context
     */
    public void init(Context context, String appName) {
        init(context);
        this.appName = appName;
    }

    /**
     * 初始化
     *
     * @param context
     */
    public void init(Context context) {

        ZogUtils.printLog(CrashHandler.class, "init CrashHandler");

        mContext = context;
        // 获取系统默认的UncaughtException处理器
        mDefaultHandler = Thread.getDefaultUncaughtExceptionHandler();
        // 设置该CrashHandler为程序的默认处理器
        Thread.setDefaultUncaughtExceptionHandler(this);
    }

    /**
     * 当UncaughtException发生时会转入该函数来处理
     */
    @Override
    public void uncaughtException(Thread thread, Throwable ex) {
        ZogUtils.printLog(CrashHandler.class,
                "App " + appName + " crash");


        if (handleException(ex)) {


            new Thread() {
                @Override
                public void run() {
                    Looper.prepare();
                    AppUtils.closeApp(mContext);
                    Looper.loop();
                }
            }.start();

        } else {
            if (mDefaultHandler != null)
                // 如果用户没有处理则让系统默认的异常处理器来处理
                mDefaultHandler.uncaughtException(thread, ex);
        }
    }

    /**
     * 自定义错误处理,收集错误信息 发送错误报告等操作均在此完成.
     *
     * @param ex
     * @return true:如果处理了该异常信息;否则返回false.
     */
    private boolean handleException(Throwable ex) {
        if (ex == null) {
            return false;
        }
        // 使用Toast来显示异常信息
        new Thread() {
            @Override
            public void run() {
                Looper.prepare();
                Toast.makeText(mContext, "很抱歉,程序出现异常,即将退出.", Toast.LENGTH_LONG)
                        .show();
                Looper.loop();
            }
        }.start();
        // 收集设备参数信息
        collectDeviceInfo(mContext);

        // 保存日志文件
        saveCrashInfo2File(ex);

        //做一些其他的事
        doSomething();

        return true;
    }

    /**
     * 收集设备参数信息
     *
     * @param ctx
     */
    public void collectDeviceInfo(Context ctx) {
        try {
            PackageManager pm = ctx.getPackageManager();
            PackageInfo pi = pm.getPackageInfo(ctx.getPackageName(),
                    PackageManager.GET_ACTIVITIES);
            if (pi != null) {
                String versionName = pi.versionName == null ? "null"
                        : pi.versionName;
                String versionCode = pi.versionCode + "";
                infos.put("versionName", versionName);
                infos.put("versionCode", versionCode);
            }
        } catch (NameNotFoundException e) {
            ZogUtils.printLog(CrashHandler.class,
                    "an error occured when collect package info");
            ZogUtils.showException(e);
        }
        Field[] fields = Build.class.getDeclaredFields();
        for (Field field : fields) {
            try {
                field.setAccessible(true);
                infos.put(field.getName(), field.get(null).toString());
//                LogUtils.printLog(CrashHandler.class,
//                        field.getName() + " : " + field.get(null));
            } catch (Exception e) {
                ZogUtils.printLog(CrashHandler.class,
                        "an error occured when collect crash info" + e);
            }
        }
    }

    /**
     * 保存错误信息到文件中
     *
     * @param ex
     * @return 返回文件名称, 便于将文件传送到服务器
     */
    private String saveCrashInfo2File(Throwable ex) {

        StringBuffer sb = new StringBuffer();
        for (Map.Entry<String, String> entry : infos.entrySet()) {
            String key = entry.getKey();
            String value = entry.getValue();
            sb.append(key + "=" + value + "\n");
        }

        Writer writer = new StringWriter();
        PrintWriter printWriter = new PrintWriter(writer);
        ex.printStackTrace(printWriter);
        Throwable cause = ex.getCause();
        while (cause != null) {
            cause.printStackTrace(printWriter);
            cause = cause.getCause();
        }
        printWriter.close();
        String result = writer.toString();
        sb.append(result);

        ZogUtils.printLog(CrashHandler.class, "\n" + sb.toString());


        try {
            long timestamp = System.currentTimeMillis();
            String time = formatter.format(new Date());
            String fileName = time + "-" + timestamp + ".log";
            if (Environment.getExternalStorageState().equals(
                    Environment.MEDIA_MOUNTED)) {
                String path = AppConfig.CACHE_DATA_DIR +"crash/"
                        + (StringUtils.isNullOrEmpty(appName) ? "" : appName + "/");
                File dir = new File(path);
                if (!dir.exists()) {
                    dir.mkdirs();
                }
                FileOutputStream fos = new FileOutputStream(path + fileName);
                fos.write(sb.toString().getBytes());
                fos.close();
            }
            return fileName;
        } catch (Exception e) {
            ZogUtils.printLog(CrashHandler.class,
                    "an error occured while writing file...");
            ZogUtils.showException(e);
        }
        return null;
    }


    /**
     * 继承的类重写doSomething，来做其他的事
     */
    public void doSomething() {
    }

}